Refrigerating system of low-temperature dehumidifier

Abstract

The utility model discloses a refrigerating system of a low-temperature dehumidifier, which comprises a compressor, an NRD differential pressure valve, a KVR condensing pressure regulating valve, a liquid storage device, a drying filter, an expansion valve, a condenser and an evaporator, an outlet of the compressor is respectively connected with the NRD differential pressure valve and an inlet of the condenser, an outlet of the condenser is connected with an inlet of the KVR condensing pressure regulating valve, and an outlet of the evaporator is connected with an outlet of the KVR condensing pressure regulating valve. An outlet of the KVR condensing pressure regulating valve is connected with an inlet of the liquid storage device, an outlet of the NRD differential pressure valve is also connected with the inlet of the liquid storage device, an outlet of the liquid storage device is connected with an inlet of the drying filter, an outlet of the drying filter is connected with an inlet of the evaporator, and an outlet of the evaporator is connected with an inlet of the compressor. According to the utility model, the automatic adjustment of the opening degree of the KVR condensing pressure regulating valve and the NRD differential pressure valve can be realized according to the temperature and pressure conditions of the condenser of the dehumidifier, so that the pressure of the condensing side in the system can be maintained in a normal range, and the dehumidification system can work stably.

Description

Technical Field

[0001] The utility model relates to the field of dehumidifier refrigeration systems, in particular to a low-temperature dehumidifier refrigeration system. Background Art

[0002] In many areas where dehumidification is needed, especially in the vast southern regions of my country, the air humidity is still high in many occasions in early spring or autumn and winter, which is commonly known as "wet cold". In this environment, the air humidity value is often higher than the air humidity requirements of some equipment or personnel, which requires dehumidification of the air. Traditional air conditioners or dehumidifiers cannot establish condensing pressure due to low ambient temperature, the system cannot work normally and the compressor oil return is poor, which can easily cause excessive wear of the compressor and greatly shorten its life. In some cases, it can even cause the compressor to get stuck and damaged. Utility Model Content

[0003] The utility model provides a low-temperature dehumidifier refrigeration system to solve the problem that the air conditioner or dehumidifier in the prior art cannot establish the operating condensation pressure when the ambient temperature is low.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A low-temperature dehumidifier refrigeration system comprises a refrigerant circulation circuit consisting of a compressor (1), a condenser (4), a liquid accumulator (8), an expansion valve (9), and an evaporator (2), and is characterized in that it also comprises a KVR condensing pressure regulating valve (6) and an NRD pressure differential valve (3), wherein the KVR condensing pressure regulating valve (6) is connected to a pipeline between an outlet of the condenser (4) and an inlet of the liquid accumulator (8) in the refrigerant circulation circuit, wherein the inlet of the KVR condensing pressure regulating valve (6) is connected to the outlet pipeline of the condenser (4), and the outlet of the KVR condensing pressure regulating valve (6) is connected to the inlet pipeline of the liquid accumulator (8); the inlet bypass of the NRD pressure differential valve (3) is connected to a pipeline between an outlet of the compressor (1) and an inlet of the condenser (4) in the refrigerant circulation circuit, and the outlet bypass of the NRD pressure differential valve (3) is connected to a pipeline between an outlet of the KVR condensing pressure regulating valve (6) and an inlet of the liquid accumulator (8).

[0006] Furthermore, in the refrigerant circulation circuit, a pipeline is connected between the outlet of the liquid storage device (8) and the inlet of the evaporator (2) and is connected to a drying filter (7).

[0007] Furthermore, in the refrigerant circulation circuit, the evaporator (2) is arranged on one side of the condenser (4), and a fan (5) is arranged on the other side of the condenser (4). Wind generated by the fan (5) first passes through the evaporator (2), then passes through the condenser (4), and is then delivered into the cabin.

[0008] The utility model adds a KVR condensing pressure regulating valve and an NRD differential pressure valve to the traditional dehumidifier refrigeration system. The entire refrigeration system relies on the automatic adjustment of the opening of the KVR condensing pressure regulating valve and the NRD differential pressure valve according to the temperature and pressure conditions of the dehumidifier condenser to maintain the condensing side pressure in the system within a normal range, thereby making the dehumidification system work stably.

[0009] Compared with the prior art, the utility model has the following advantages:

[0010] 1. The refrigeration system of the low-temperature dehumidifier of the utility model is characterized in that a KVR condensing pressure regulating valve and an NRD differential pressure valve are added in the refrigeration system, which effectively solves the problem that the refrigeration system cannot be started under low temperature conditions, and achieves the purpose of simple, reliable and efficient control.

[0011] 2. The KVR condensing pressure regulating valve and NRD differential pressure valve added to the refrigeration and dehumidification system of the utility model are purely mechanical components. They can automatically open and close and adjust the opening size according to the pressure at the front and rear ends of the valve. They do not require the participation of electrical control, thus achieving the purpose of simple, reliable and efficient control.

[0012] 3. The refrigeration system of the low-temperature dehumidifier of the utility model uses the principle of freezing and dehumidification to dehumidify, and its dehumidification efficiency is higher than that of other dehumidifiers.

[0013] 4. The refrigeration system of the low-temperature dehumidifier of the utility model only adds a KVR condensing pressure regulating valve and an NRD differential pressure valve to the traditional refrigeration and dehumidification system, which has the advantages of small space occupation and reliable operation of the overall system, while also saving initial investment costs and later practical maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural principle diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] like Figure 1 As shown, this embodiment discloses a refrigeration system of a low-temperature dehumidifier, including a compressor 1, a condenser 4, a liquid storage tank 8, an expansion valve 9, a drying filter 7, an evaporator 2, and also includes an NRD pressure differential valve 3 and a KVR condensing pressure regulating valve 6.

[0017] In a conventional refrigerant circulation loop, the outlet of the compressor 1 is connected to the inlet of the condenser 4 through a pipeline, the outlet of the condenser 4 is connected to the inlet of the liquid accumulator 8 through a pipeline, the outlet of the liquid accumulator 8 is connected to the inlet of the expansion valve 9 through a pipeline, the outlet of the expansion valve 9 is connected to the inlet of the filter drier 7 through a pipeline, the outlet of the filter drier 7 is connected to the inlet of the evaporator 2 through a pipeline, and the outlet of the evaporator 2 is connected to the inlet of the compressor 1 through a pipeline. In a conventional refrigerant circulation loop, the high-temperature refrigerant output by the compressor 1 first enters the condenser 4 to release heat, and the refrigerant after release of heat passes through the liquid accumulator 8 and the expansion valve 9 in turn to form a low-temperature refrigerant, which is then dried and filtered by the filter drier 7 and sent to the evaporator 2, and the low-temperature refrigerant exchanges heat with the wind passing through the evaporator 2 in the evaporator 2 to achieve cooling of the wind, and the refrigerant flowing out of the evaporator 2 after heat exchange returns to the compressor 1, thereby forming a refrigerant cycle.

[0018] In this embodiment, the pipeline between the outlet of the condenser 4 and the inlet of the liquid storage tank 8 of the traditional refrigerant circulation loop is connected to the KVR condensing pressure regulating valve 6. Specifically, the inlet of the KVR condensing pressure regulating valve 6 is connected to the outlet pipeline of the condenser 4, and the outlet of the KVR condensing pressure regulating valve 6 is connected to the inlet pipeline of the liquid storage tank 8.

[0019] In this embodiment, an NRD pressure differential valve 3 is arranged in a traditional refrigerant circulation circuit, and the inlet of the NRD pressure differential valve 3 is connected to the pipeline between the outlet of the compressor 1 and the inlet of the condenser 4 through a pipeline bypass, and the outlet of the NRD pressure differential valve 3 is connected to the pipeline between the outlet of the KVR condensing pressure regulating valve 6 and the inlet of the liquid storage tank 8 through a pipeline bypass.

[0020] The entire refrigeration and dehumidification system can automatically adjust the opening of the KVR condensation pressure regulating valve 6 and the NRD pressure differential valve 3 according to the temperature and pressure conditions of the dehumidifier condenser 4 to maintain the condensation pressure on the condensation side of the refrigeration and dehumidification system within a normal range, so that the dehumidification system can work stably.

[0021] The prior art refrigeration dehumidifier uses a vapor compression condensing refrigeration method to remove moisture from the air. When the ambient temperature of the vapor compression refrigeration system is low, if the condenser is installed and works normally, the condensation temperature will be very low, and the condensation pressure will also be very low, resulting in a small pressure difference between the condensation side and the evaporation side of the evaporation system, and the refrigerant flow rate in the system will be very low. Most of the refrigerant will accumulate in the condenser, resulting in system refrigeration abnormalities and insufficient oil return from the compressor, thereby damaging the refrigeration components.

[0022] The improved dehumidifier refrigeration system of this embodiment is additionally provided with a KVR condensing pressure regulating valve 6 and a NRD pressure differential valve 3. By setting the appropriate opening pressure of the KVR condensing pressure regulating valve 6, the system condensing pressure can be maintained in a low temperature environment. When the condensing pressure is lower than the set value of the KVR condensing pressure regulating valve 6, the KVR condensing pressure regulating valve 6 is in a closed state, and the refrigerant will directly send the exhaust gas of the compressor 1 to the liquid storage tank 8 from the pipeline where the NRD pressure differential valve 3 is located. At this time, the pressure drop on the condensing side will be very small, and the pressure on the condensing high-pressure side will not be low, so that the pressure difference between the high and low pressure sides of the entire refrigeration system can be smoothly established to achieve normal operation of the system.

[0023] After a period of operation, due to the continuous operation of the compressor 1, the temperature in the refrigeration system will rise, and the pressure on the condensing side will also increase accordingly. Since the KVR condensing pressure regulating valve 6 and the NRD differential pressure valve 3 are both purely mechanical structures, the opening of the KVR condensing pressure regulating valve 6 depends only on the pressure of the inlet, and the opening of the NRD differential pressure valve 3 depends on the pressure difference between the inlet and the outlet, so the KVR condensing pressure regulating valve 6 and the NRD differential pressure valve 3 are automatically adjusted in real time according to the pressure value. When the pressure on the condensing side rises to exceed the set value of the KVR condensing pressure regulating valve 6, the KVR condensing pressure regulating valve 6 will be partially opened, and the opening of the NRD differential pressure valve 3 will be reduced accordingly, until the pressure in the condenser 4 rises to the normal level, the KVR condensing pressure regulating valve 6 is fully opened, the NRD differential pressure valve 3 is fully closed, and the system enters the normal refrigeration and dehumidification operation.

[0024] This embodiment is applied to the dehumidifier and needs to be operated with an air circulation system. Specifically, a fan 5 is used to realize air circulation. The fan 5 is arranged on one side of the condenser 4, and the evaporator 8 is arranged on the other side of the condenser 2. The air circulation is Figure 1 The large black arrow indicates the process. Under the action of the wind of the fan 5, the air in the cabin first passes through the evaporator 2 and then passes through the condenser 4. The air is then sent into the cabin by the fan 5. The air circulation is driven by the fan 5 of the dehumidifier to realize air circulation. The air circulation is combined with the refrigeration system to achieve the purpose of dehumidification.

[0025] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. Such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0026] The present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A low-temperature dehumidifier refrigeration system, comprising a refrigerant circulation circuit consisting of a compressor (1), a condenser (4), a liquid storage device (8), an expansion valve (9), and an evaporator (2), characterized in that: The invention also comprises a KVR condensing pressure regulating valve (6) and an NRD pressure differential valve (3), wherein the KVR condensing pressure regulating valve (6) is connected to a pipeline between an outlet of a condenser (4) and an inlet of a liquid storage device (8) in a refrigerant circulation circuit, wherein the inlet of the KVR condensing pressure regulating valve (6) is connected to the outlet pipeline of the condenser (4), and the outlet of the KVR condensing pressure regulating valve (6) is connected to the inlet pipeline of the liquid storage device (8); the inlet bypass of the NRD pressure differential valve (3) is connected to a pipeline between an outlet of a compressor (1) and an inlet of a condenser (4) in the refrigerant circulation circuit, and the outlet bypass of the NRD pressure differential valve (3) is connected to a pipeline between an outlet of the KVR condensing pressure regulating valve (6) and an inlet of a liquid storage device (8).

2. A low-temperature dehumidifier refrigeration system according to claim 1, characterized in that: In the refrigerant circulation loop, a pipeline is connected between the outlet of the liquid storage device (8) and the inlet of the expansion valve (9) and is connected to a drying filter (7).

3. A low-temperature dehumidifier refrigeration system according to claim 1, characterized in that: In the refrigerant circulation circuit, the evaporator (2) is arranged on one side of the condenser (4), and a fan (5) is arranged on the other side of the condenser (4). Wind generated by the fan (5) first passes through the evaporator (2), then passes through the condenser (4), and is then delivered into the cabin.

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